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Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule for Available-for-Sale Securities

The following is a summary of available-for-sale securities as of September 30, 2021 (in thousands):


	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Losses)		Estimated Fair Value
Tax-exempt municipal securities	$	18,520	$	465	$	—	$	18,985
Corporate debt securities	10,940		274		—		11,214
Total	$	29,460	$	739	$	—	$	30,199

The following is a summary of available-for-sale securities as of December 31, 2020 (in thousands):


	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Losses)		Estimated Fair Value
Tax-exempt municipal securities	$	19,924	$	365	$	—	$	20,289
Corporate debt securities	17,086		452		—		17,538
Total	$	37,010	$	817	$	—	$	37,827

Schedule of Maturities of Marketable Securities

The following table summarizes the maturities of the Company’s marketable securities as of December 31, 2020 and September 30, 2021 (in thousands):


	December 31, 2020		September 30, 2021
Due within one year	$	7,557	$	2,632
Due after one year through five years	30,270		27,567
Total	$	37,827	$	30,199

Schedule of Proceeds from the Maturities of Available-for-Sale Securities

The following table summarizes the proceeds from the maturities and sales of available-for-sale securities for the three and nine months ended September 30, 2020 and 2021 (in thousands):


	For the three months ended September 30,				For the nine months ended September 30,
	2020		2021		2020		2021
Maturities of marketable securities	$	3,999	$	1,900	$	21,404	$	7,495
Sales of marketable securities	—		1,805		1,464		1,805
Total	$	3,999	$	3,705	$	22,868	$	9,300